arch/x86/mach-generic/summit.c

   1 /*
   2  * APIC driver for the IBM "Summit" chipset.
   3  */
   4 #define APIC_DEFINITION 1
   5 #include <linux/threads.h>
   6 #include <linux/cpumask.h>
   7 #include <asm/mpspec.h>
   8 #include <asm/genapic.h>
   9 #include <asm/fixmap.h>
  10 #include <asm/apicdef.h>
  11 #include <linux/kernel.h>
  12 #include <linux/string.h>
  13 #include <linux/init.h>
  14 #include <asm/summit/apicdef.h>
  15 #include <linux/smp.h>
  16 #include <asm/summit/apic.h>
  17 #include <asm/summit/ipi.h>
  18 #include <asm/summit/mpparse.h>
  19
  20 static int probe_summit(void)
  21 {
  22         /* probed later in mptable/ACPI hooks */
  23         return 0;
  24 }
  25
  26 static cpumask_t vector_allocation_domain(int cpu)
  27 {
  28         /* Careful. Some cpus do not strictly honor the set of cpus
  29          * specified in the interrupt destination when using lowest
  30          * priority interrupt delivery mode.
  31          *
  32          * In particular there was a hyperthreading cpu observed to
  33          * deliver interrupts to the wrong hyperthread when only one
  34          * hyperthread was specified in the interrupt desitination.
  35          */
  36         cpumask_t domain = { { [0] = APIC_ALL_CPUS, } };
  37         return domain;
  38 }
  39
  40 struct genapic apic_summit = APIC_INIT("summit", probe_summit);